The focal lengths of the objective and of the eye-piece of a compound microscope are fo and fe respectively. If L is the tube length and D, the least distance of distinct vision, then its angular magnification, when the image is formed at infinity, is

Question:

Options :

(a) (1-L/fo)(D/fe)
(b) (1+L/fo)(D/fe)
(c) L/fo(1-D/fe)
(d) L/fo(1+D/fe)
(e) L/fo(D/fe)

Answer :

(e) L/f_o(D/f_e)

Answer Steps :

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Two resistors having equal resistances are joined in series and a current is passed through the combination. Neglect any variation in resistance as the temperature changes. In a given time interval (a) Equal amount of thermal energy must be produced in the resistors(b) Unequal amounts of thermal energy may be produced (c) The temperature must rise equally in the resistors (d) The temperature must rise unequally in the resistors

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If current in an electric bulb changes by 1%, then the power will change by (a) 1%(b) 2%1000 OF(c) 4% anda darse(d) =%2

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